Targeting integrins: Insights into structure and activity of cyclic RGD pentapeptide mimics containing azabicycloalkane amino acids
作者:Laura Belvisi、Anna Bernardi、Matteo Colombo、Leonardo Manzoni、Donatella Potenza、Carlo Scolastico、Giuseppe Giannini、Marcella Marcellini、Teresa Riccioni、Massimo Castorina、Pietro LoGiudice、Claudio Pisano
DOI:10.1016/j.bmc.2005.08.048
日期:2006.1
integrin antagonist. Structure determination of the cyclic RGD pentapeptide mimics performed by a combination of NMR spectroscopy, and molecular mechanics and dynamics calculations showed a strong dependence of the RGD cyclopeptide conformation on lactam ring size and stereochemistry. ST1646 revealed the highest ability within the library to adopt the proper RGD orientation required for binding to the alpha(v)beta3
合成了包含立体异构体5,6-和5,7-稠合的双环内酰胺的环状RGD五肽模拟物的小文库。发现该文库包含α(v)beta3整联蛋白的高亲和力配体。这项研究的目的是调查这些配体的活性,选择性和结构,以鉴定可以被评估为肿瘤血管生成抑制剂的新的特异性α(v)-整联蛋白拮抗剂。体外筛选,包括对纯化的alpha(v)beta3,alpha(v)beta5和alpha5beta1整联蛋白的受体结合测定,以及血小板聚集测定,表明ST1646是一种有效的,高度选择性的alpha(v)beta3 / alpha(v) beta5整合素拮抗剂。环状RGD五肽模拟物的结构测定是通过NMR光谱结合进行的,分子力学和动力学计算表明,RGD环肽构象对内酰胺环的大小和立体化学有很强的依赖性。ST1646揭示了文库中具有最高能力来采取与α(v)beta3整联蛋白结合所需的正确RGD方向,这是由最近解析的整齐蛋白α(v)bet